Mostly environment/tooling additions and improvements.

What’s changed:

• Add build.yml GitHub CI, to verify that commits and PRs compile.
• Add release.yml GitHub CI, to build and attach the mod to releases.
• Minor tweaks to the build script.
• Add a VSCode task to build the project without running a command.

Progress so far (so no changes here ¯_(ツ)_/¯):

• ✅ VFS (Virtual File System).
• ✅ Write the fake System.IO functions.
• ❌ Write/Read the .msa (Mechanica Save Archive) file.
• ❌ Intercepting the system functions.
• ❌ Write the triggers that will fire the capture/emission of virtual files.
• ❌ Add display/support for the new save format in the world selection menu.